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Effect of Soil-Applied Chlorsulfuron on Canada Thistle (Cirsium arvense) Root and Root Bud Growth

Published online by Cambridge University Press:  12 June 2017

William W. Donald
William W. Donald*
Affiliation:
U.S. Dep. Agric., Metabolism and Radiation Res. Lab., Fargo, ND 58105
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Abstract

Chlorsulfuron [2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino] carbonyl] benzenesulfonamide], applied at 9 to 560 g ai/ha to the soil surface, stopped shoot elongation of well established Canada thistle [Cirsium arvense (L.) Scop. #4 CIRAR] plants in the greenhouse. Root fresh weight decreased progressively as chlorsulfuron rate was increased when measured 1 month after treatment. In contrast, the number of visible root buds plus secondary shoots increased 1.9- to 2.3-fold between 9 and 67 g/ha chlorsulfuron 1 month after soil surface treatment. Despite more numerous root buds, the number of secondary shoots arising from adventitious root buds progressively decreased as chlorsulfuron rate was raised. Increases in the number of visible root buds were observed first between 3 and 4 weeks following soil application with 67 g/ha of chlorsulfuron, 2 weeks after shoot growth stopped.

Keywords

Growth inhibitorsherbicidegrowth stimulatorsulfonylureaCIRAR
Type
Research
Information
Weed Technology , Volume 1 , Issue 2 , April 1987 , pp. 154 - 161
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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